JP5731243B2 - Fixed dam construction method - Google Patents

Description

  The present invention relates to a fixed dam dredging system for dredging sand accumulated in a dam lake or lake and its construction method.

  The dredging and treatment of sand accumulated in dam lakes and lakes is necessary to maintain the water storage capacity of dams and the like, especially in dams for hydroelectric power generation, sedimentation near the water intake is a problem. Therefore, as a conventional dredging method, for example, dredging with a grab by a grab ship, or as described in Patent Document 1 or Patent Document 2, a work ship or the like is floated on a dam lake or a lake, or a pump ship or Dredging with an underwater sand pump. Such a dam construction method is known.

JP 2004-92077 A JP 2008-223433 A

  However, in the conventional dam dredging method, workers with special techniques are required for operations of grab ships and cutter pump ships and handling of submersible sand pumps by crane ships.技術 Technology succession is a problem. In addition to dredgers, drawing boats, etc. are required, which is a large-scale construction, and every time dredging work, dredgers must be transported to the dam lake or lake by land. Furthermore, because of dredging work by the work boat, dangerous work such as boat transfer, anchor replacement, setup change, etc. occurs. The dredging work according to the prior art cannot suppress the occurrence of turbidity. The fixed dam dredging system and its construction method according to the present invention have been proposed in order to solve such problems.

The gist for achieving the object by solving the above-mentioned problems of the fixed dam construction method according to the present invention is as follows:
A sand discharge pipe having a skirt portion at the bottom, a high-pressure water injection pipe for discharging driving water to the skirt portion and discharging sand from the sand discharge tube, and a nozzle disposed at the bottom of the sand discharge tube A dredging pump comprising a liquefied injection pipe for liquefying the earth and sand around the nozzle with liquefied water to be liquefied, and fixing the dredging pump at a position near the inflow portion of the dam lake or near the water intake we established, the dredging pump installed in a soil deposited on the lake bottom soil, the soil deposited on the lake bottom in the absence of turbidity by driving the dredging pump elsewhere or Mizuumigai the dam It is to drain sand to a certain dump site.

The gist for achieving the object by solving the above-mentioned problems of the fixed dam construction method according to the present invention is as follows:
A sand discharge pipe having a skirt portion at a lower portion, a high pressure water injection pipe for injecting driving water to the skirt portion to discharge sand from the sand discharge tube, and a pipe disposed at a lower portion of the sand discharge tube. And forming a dredging pump comprising a liquefied spray pipe for liquefying the earth and sand around the nozzle with liquefied water sprayed from a nozzle provided in the pipe, and taking water from the dredging pump and the lake the dredge pump and is supported on the superstructure of Dolphin formed by installing a depth surveying instrument for monitoring the Rutotomoni depth and dredging for intake pump for supplying the pump is supported from the lake bottom ground with pillars pile Dolphin together with installed fixed to the position of the flow in the vicinity or in the water inlet near the dam, the was placed in a sand deposited on the bottom of the lake ground, one end portion connected to sediment tube of the dredge pump with lake Luo dam elsewhere or soil dump that is outside the lake lake Haisuna connecting pipe the other end is guided is arranged from the lake to the earth ponds, of the high pressure water injection pipe by driving the water intake pump High pressure water is sprayed from the nozzle to the skirt portion of the sand discharge pipe in the dredging pump, and liquefied water is sprayed from the liquefied spray pipe onto the sediment deposited on the bottom of the lake, so that the water depth near the dredging pump is increased. It is to make the earth and sand into a slurry form from the sand discharge pipe of the dredging pump and discharge it to a soil disposal site so that turbidity does not occur while monitoring .

According to the fixed dam dredging system and the construction method of the present invention, dredging pumps are permanently installed in, for example, a dam lake.
In addition, work on the lake is eliminated, and special work by dredgers and work boats is eliminated. This is an effective construction method for securing workers and safety.
Since the dredging pump is in the earth and sand, it becomes a construction method that does not cause turbidity and has a high slurry mud content and low energy consumption in slurry transportation.
Since there are no rotating parts or other mechanical parts in the collar, there is no fear of wear or mechanical failure. Moreover, since it is not a dredging by an underwater sand pump, there are many excellent effects that an electric motor, a cable, and the like are not submerged in water and are highly safe.

It is sectional drawing for description which shows the outline | summary of the fixed dam construction method concerning this invention. It is a reference figure which shows a preferable location as a place to which the fixed dam construction method according to the present invention is applied. Front view (A) of a dredge pump 1 used in the fixed dam dredging method of the present invention, a schematic perspective view (B) showing the configuration of the use state, and perspective views of dredge pumps 1a and 1b according to other embodiments It is figure (C), (D). It is sectional drawing for description which shows the state during the dredging operation | work by the dredge pump 1. FIG. It is an expanded sectional view which expands and shows the mode of a dredging operation | work. It is sectional drawing which shows a mode that dredging the intake of a dam lake.

  As shown in FIG. 1, the fixed dam dredging method according to the present invention dreds earth and sand 2 a accumulated in a dam lake 2 or the like with a fixed dredging pump 1.

  As shown in FIGS. 2 (A) and 2 (B), the dredging pump 1 has a sand discharge pipe 4 having a skirt portion 3 at a lower portion, and sprays driving water onto the skirt portion 3 to produce slurry-like earth and sand. A high-pressure water injection pipe 5 for discharging the sand from the sand discharge pipe 4 and a liquefaction injection for liquefying the earth and sand around the nozzle 6 with liquefied water disposed at the lower part of the sand discharge pipe 4 and injected from the nozzle 6 It consists of a pipe 7.

  The dredging pump 1 is fixedly installed at a desired position in the dam lake 2. As the desired position, as shown in FIG. 1B, there are the vicinity of the upstream inflowing portion, the vicinity of the inflowing portion, the vicinity of the intake port and the like indicated by the hatched portion when viewed from above.

  As shown in FIGS. 1A and 4, a lake bottom ground is provided with a water intake pump 10 that takes water from the dredging pump 1 and the dam lake 2 and supplies the dredging pump 1 as drive water or liquefied water. 11 is supported by a dolphin superstructure 13 supported by a column pile 12 of dolphin, and the dredging pump 1 is installed in a fixed position in the earth and sand 2a deposited on the lake bottom ground 11.

  Furthermore, as shown in FIG. 1-A, the sand discharge connecting pipe 14 having one end connected to the sand discharge pipe 4 of the dredging pump 1 and the other end guided from the lake surface to a predetermined soil disposal site from above the lake surface. Place it at another place on the dam lake 2 or outside the lake. The sand removal connecting pipe 14 is supported by a plurality of floaters 14a.

  In this way, after the dredging pump 1 is fixed and installed at a desired position in the dam lake 2, the water intake pump 10 is driven, and as shown in FIG. High pressure water is sprayed from 5a onto the skirt portion 3 of the sand discharge pipe 4 in the dredge pump 1. As a result, the surrounding slurry-like earth and sand 2 a is sucked into the skirt portion 3 by negative pressure and is discharged through the sand discharge pipe 4.

  Further, the liquefied water is sprayed from the nozzle 6 of the liquefied spray pipe 7 toward the earth and sand 2 a accumulated on the lake bottom ground 11. The earth and sand 2a rolls up in a slurry state, is attracted to high-pressure water injected from the nozzle 5a of the high-pressure water injection pipe 5, and is discharged from the skirt portion 3 through the sand discharge pipe 4. Then, the earth and sand 2a is slurried from the sand discharge pipe 4 of the dredging pump 1 by the sand discharge connecting pipe 14 and discharged out of the dam lake 2. If the sand discharge connecting pipe 14 is discharged to a position lower than the water surface height of the dam lake, the slurry-like earth and sand 2a passes through the skirt portion 3 and is more easily discharged to the outside by the principle of siphon.

As shown in FIG. 4, the earth and sand 2a is formed so that, for example, a sand trap having a radius of about 26 m and a height of 15 m is indicated by a broken line, and the earth and sand 2a of 10,000 m ³ or more can be dredged. . This dredging does not cause turbidity because the dredging pump 1 is present in the earth and sand 2a.

  As Example 2 of the present invention, the combination of the pipe and the nozzle in the liquefied injection pipe is such that the nozzle 6 is provided in the pipe 7 extending in the horizontal direction as in Example 1, and FIG. As shown in FIG. 1, there is a dredging pipe 1a including a pipe 7 extending in the horizontal direction, a vertical pipe 15 suspended from the middle of the horizontal pipe 7, and a nozzle 6 provided in the vertical pipe 15. If it is this vertical type, it is possible to make the nozzle 6 dig deeply into the earth and sand 2a and make it into a slurry form.

  As Example 3 of the present invention, the direction of the injection port of the nozzle 6 in the liquefied injection pipe 7 is all set downward (in the case of Example 1), as shown in FIG. When all are installed toward the skirt part 3 of the sand removal pipe 4, there are a mixture of those installed downward and those installed toward the skirt part 3 of the sand removal pipe 4 although not shown. There are three ways of installation.

  By directing all of the injection ports of the nozzle 6 toward the skirt portion 3, the earth and sand 2a is in a state having a high slurry mud content, and is easily sucked into the sand discharge pipe 4, thereby improving energy efficiency. Also, if the nozzles 6 are mixed downward and upward, the nozzles 6 can be properly used depending on the sedimentation characteristics of the sediment 2a and the sediment properties such as viscosity, etc., and the sediment 2a is efficiently made into a slurry. be able to.

  In addition, the operation of the water intake pump 10 may be remotely controlled, or may be automatically operated. A water depth measuring device using ultrasonic waves may be installed on the dolphin superstructure 13 or the dolphin column pile 12 so as to constantly monitor the water depth in the vicinity of the dredging pump 1. It is also preferable to install the plurality of dredging pumps 1 with the dolphin superstructure 13 in the form of a pier.

  The fixed dam construction method according to the present invention can be applied not only to dam lakes but also to lakes and harbors.

1 Pump for firewood,
1a, 1b Dredging pump according to another embodiment 2 Dam lake, 2a Accumulated earth and sand,
3 Skirt,
4 Sand removal pipe,
5 High pressure water injection pipe, 5a Main nozzle,
5b Water supply vertical pipe,
6 nozzles,
7 Liquefaction injection pipe, 7a Water supply vertical pipe,
8 connecting members,
9 Dam dam body,
10 Water intake pump,
11 Lake bottom ground,
12 Dolphin pillar pile,
13 Dolphin superstructure,
14 waste sand connecting pipe, 14a floater,
15 Vertical pipe.

Claims (2)

A sand discharge pipe having a skirt portion at the bottom, a high-pressure water injection pipe for discharging driving water to the skirt portion and discharging sand from the sand discharge tube, and a nozzle disposed at the bottom of the sand discharge tube Forming a dredge pump comprising a liquefied injection pipe for liquefying the earth and sand around the nozzle with liquefied water to be liquefied,
The dredging pump is fixedly installed in the vicinity of the inflow part of the dam lake or near the water intake , and the dredging pump is installed in the sediment deposited on the bottom of the lake to drive the dredging pump. Draining the sediment deposited on the bottom of the lake without turbidity to other places in the dam lake or to a landfill outside the lake ,
This is a fixed dam construction method. A sand discharge pipe having a skirt portion at a lower portion, a high pressure water injection pipe for injecting driving water to the skirt portion to discharge sand from the sand discharge tube, and a pipe disposed at a lower portion of the sand discharge tube. Forming a dredge pump comprising a liquefied spray pipe for liquefying the earth and sand around the nozzle with liquefied water sprayed from a nozzle provided in the pipe;
Dolphin formed by installing a depth surveying instrument for monitoring the Rutotomoni depth and intake pump supplied to the dredging pump with intake is supported by Dolphin pillar pile from the lake bottom ground from dredging pump and lakes with installed fixed to the position of the flow in the vicinity or in the water inlet near the dam the dredge pump and is supported on the superstructure, placed in a sediment deposited on the bottom of the lake ground,
Placing Haisuna connecting pipe having one end and the other end portion is guided to the connected soil dump in elsewhere or lake outside the dam lake lake to sediment tube of the dredge pump from the lake to the soil dump And
The water intake pump is driven to inject high pressure water from the nozzle of the high pressure water injection pipe onto the skirt portion of the sand discharge pipe in the dredging pump, and liquefied water is accumulated on the lake bottom ground from the liquefaction injection pipe. It is injected into the earth and sand, and the soil is discharged from the sand pipe of the dredging pump into the slurry via the sand discharge connecting pipe so as to prevent turbidity while monitoring the water depth in the vicinity of the dredge pump. Sanding,
This is a fixed dam construction method.

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